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- Below is the equation for a nucleophilic substitution reaction and some experimental data. CH3CH2Br + CH3COO- ⇌ CH3CH2CO2CH3 + Br- Rate = k [CH3CH2Br][CH3COO-] Which mechanism would best fit the data?Below is the equation for a nucleophilic substitution reaction and some experimental data. CH3CH2Br + CH3COO- ⇌ CH3CH2CO2CH3 + Br- ΔH=-75 kJ/mol Rate = k [CH3CH2Br][CH3COO-] Which reaction energy profile would be the best representative of the data provided?EFFECTS OF SUBSTITUENTS ON ELECTROPHILIC AROMATIC SUBSTITUTIONA halogen group (-X) is deactivating, what place would it occupy on the following scale? –NO2 > –CN > –SO3H > –CHO > –COR > –COOH > –COOR > –CONH2 > –CCl3 more deactivating less deactivating
- 1. Which of the following is the strongest nucleophile? Refer to the diagram below with an MeOH, MeSH, etc. 2. Which of the following is true about the stereochemistry of SN1 reaction?a.retention of configuration at the electrophilic centerb.50:50 mixture of retention and inversion of configuration at the electrophilic centerc.inversion of configuration at the electrophilic centerd. slightly more inversion than retention at the electrophilic centerFor each reaction, give the expected solution product and predict whether the machanism will be first order (SN1) or second order (SN2) : a) 2-chloro-2-methylbutane +CH3COOH b) isobutyl bromide + NaOMe c) 1-iodo-1-methylcyclohexane + CH3CH2OHRank the species below in order of increasing nucleophilicity in protic solvent. I. H2O II. CH3S— III. CH3COO— IV. t-BuO— I, II, IV, III I, III, II, IV I, III, IV, II I, II, III, IV
- Does the data provide evidence for the claim that the reaction of Br2 with alkenes proceeds via anti‐addition? YES OR NOW AND WHY The mleting point of the product was found to be 234.5-235.5C chemical reaction: trans-stilbene+pyrimindine tribromide --->acetic acid 1,2-di bromo-1,2-diphenylethane product was trans-1,2-dibromo-1,2-diphenylethane3. Based on the definitions of the terms below select the best classification for the following reactive species below: nucleophile; electrophile; free radical; carbocation; carboanion, electron rich species, delocalized electrons (i) CH3-: …………………………………………(ii) Br ∙ : …………………………………………. (iii) H2O : …………………………………………. (iv) CN- : ………………………………………….(v) Cl+: …………………………………………….(vi) CH3CH2+: ……………………………………..(vii) CH3∙ : …………………………………………… (viii) CH2CH2 : …………………………………………..The following reaction has a ΔSsystem < 0 O2(g) → 2O(g) T or F can you explain why this is false?
- The methoxy group is reported as having σpara and σmeta values that differ in sign (σmeta =+0.12; σpara = –0.27). What specific experiments are performed to determine these s values?Explain why the σpara and σmeta values are of different sign and what those signs indicate.Choose the best reagents from the list provided below for carrying out the following conversion. Match the reagent with the step number. HCl (aq), Zn(Hg) KMnO4, H3O+ CH3Cl, AlCl3 HNO3, H2SO4 Cl2, FeCl3 fuming sulfuric acidsummarize in a table how SN2 type reactions are characterized in terms of the following criteria: (1) choice of nucleophile; (2) substrate (RX); (3) solvent; (4) kinetics (order of reaction and rate law); (5) stereochemistry; (6) possibility of rearrangements.